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From:	"Robert Collins" <robert DOT collins AT itdomain DOT com DOT au>
To:	"Ken Tew" <ken2 AT andrew DOT cmu DOT edu>, <cygwin AT cygwin DOT com>
References:	<Pine DOT LNX DOT 4 DOT 21L-021 DOT 0107131554450 DOT 6237-300000 AT unix47 DOT andrew DOT cmu DOT edu>
Subject:	Re: Bug in pthread_cond_signal under Win NT 4.0
Date:	Sat, 14 Jul 2001 13:48:20 +1000
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X-OriginalArrivalTime:	14 Jul 2001 03:35:08.0058 (UTC) FILETIME=[FA8E97A0:01C10C15]

Ken, what version of the cygwin .dll did you create this patch against?

IIRC we fixed this bug a few weeks ago.

Rob

----- Original Message -----
From: "Ken Tew" <ken2 AT andrew DOT cmu DOT edu>
To: <cygwin AT cygwin DOT com>
Sent: Saturday, July 14, 2001 6:10 AM
Subject: Bug in pthread_cond_signal under Win NT 4.0


>
> If you signal a condition variable without any threads actually waiting
> on the condition variable, then when a thread does wait on that variable
> it will hang.
>
> I've attached the file pthread_bug_test.cpp which is a simple program to
> demonstrate the bug.
>
> I also attached a modified thread.cc which fixes the bug.  It simply
> checks to see if any threads are waiting on the condition before
> signalling.  The only change I made to thread.cc was adding the line:
>   if (waiting)
> at line 452 in the file.
>
> ----------
>                                           \//////
>                                           [ O o ]
>  Ken Tew - Licensed to Program             \_=_/
>    http://www.pitt.edu/~ktew               _| |_
>                                           / \_/ \
> ________________________________________oOOO___OOOo__
>


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